Modular shelter



FIG. 1 is a perspective view of the modular shelter, showing my new design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a side elevation view thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a modular shelter, as shown and described. 